Make label-notify action edit body
Created by: felixfbecker
This changes something about label-notify that has been bothering me for a while:
label-notify will post a comment, meaning that in your email inbox you will get an email with that comment, but the email actually contains no information about the issue itself other than the title. You always have to open it in your browser. With many issues filed, that is super annoying.
This instead changes the behavior to edit the body of the issue, appending a /cc @whoever
to it. That will equally trigger an email notification, but this time the entire issue body is part of the email, meaning it's quick to triage issues right in the inbox.
Test plan
Only updates GitHub action, not production code touched. Tested in external repo.